My only point is on South side of 71/73 columns you see evidence of deflected deck causing punch shear at columns. Note the unzipped structural slab on south side separating from stamped concrete topping. But then just North of columns you see the structural slab and stamped concrete sheared...
What I am seeing is structural slab draped due to middle deflection South of and between columns. So stamped concrete followed structural slab deflection, but was left up and did not collapse to garage floor in those areas when structural slab punched.
In Symp's 3D images, there appears to be different types of failure happening on either side of Column Lines between parking spots 71 and 73. Question is which direction does this say collapse is progressing? One side of column deflection of slab causes draping of stamped concrete, where as...
The other thought is all the flexing of the elevated parking deck has added weakness in specific locations based upon loading of that area, and slab deterioration in that area. So we do not have uniform structural properties in the reinforced concrete structure, which is an unknown variable in...
We are talking a 2-way reinforced rebar grid slab, and more significant deterioration of structural slab under planters, due to no water proofing membrane under stamped concrete with edge of stamped concrete butting up to Southside planter wall. Then add pool exhaust chemicals mixing in plants...
I agree with reading the tea leafs, and I do think that skill is a speciality gained long after the college basic broad ‘cook book’ foundation is poured.
Where I live, there is frequent DoD missile testing and explosions, perhaps 15 to 20 miles from my house, which is on slope of limestone...
Thanks MaudSTL for clarifying that.
Edit: Red Corona I agree with your post that 1:10am noise could have been as you cite, and yes I mixed up the two witness groups and events.
For those who can think outside of their own sandbox, it makes perfect sense, without 'stretching imagination'...
However, if their parking spot was say in North East Corner near the East Stair Tower and I lived on first floor, I for one would take the stairs as the shortest direct path to my apartment/condo. Especially if justing getting back from a gym workout.
So it is possible they immediately...
IanCA, I follow your logic on the West to East diverging progression of the possible initial break under North Parking Deck Planter wall, and feel the tear at the East end that you illustrated in the pool deck, is consistent with that being a temporary stopping point of initial collapse...
With IanCA's latest Visualization tool, I am trying to understand the possible implied sequence of events. I have added numbers at end of his arrows trying to understand perhaps an implied sequence of events.
It appears that perhaps step one is the E-W cracking of slab under parking deck...
In SFCharlie’s GIF, I see the cloud of dust from building collapse originating closer to column I9.1 and moving East as it vents. It appears to me, the well coated pilaster at South wall was an earlier dust blast, when the parking garage/pool deck collapsed along on near K line.
EDIT: In...
